641100985 has 16 divisors (see below), whose sum is σ = 895815936. Its totient is φ = 431316288.

The previous prime is 641100979. The next prime is 641101001. The reversal of 641100985 is 589001146.

It is a cyclic number.

It is not a de Polignac number, because 641100985 - 2⁷ = 641100857 is a prime.

It is a super-2 number, since 2×641100985² = 822020945935940450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641100985.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170949 + ... + 174658.

It is an arithmetic number, because the mean of its divisors is an integer number (55988496).

Almost surely, 2^641100985 is an apocalyptic number.

It is an amenable number.

641100985 is a deficient number, since it is larger than the sum of its proper divisors (254714951).

641100985 is a wasteful number, since it uses less digits than its factorization.

641100985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345672.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 641100985 is about 25319.9720576465. The cubic root of 641100985 is about 862.2677596378.

The spelling of 641100985 in words is "six hundred forty-one million, one hundred thousand, nine hundred eighty-five".